DCC     Basics    DCC Chatting     Choosing the transfer method     DCC file sending     DCC file receiving
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Snak Manual

Connecting to a server
Joining channels
Sending messages
Keeping track of people
Customization and settings
Using DCC
IRC commands



DCC stands for Direct Client to Client, and is a method of transferring files and setting up an uninterruptible chat connection between you and someone else. DCC is subject to some limitations and complications due to the common use of firewalls, routers and wireless access points like AirPort.

Once the DCC connection is established it is independent of IRC, but the initial messages to establish the connection are sent via normal IRC messages.

Normally, when you browse the web or send email everything works pretty much transparently even if you use a firewall, router or wireless access. That's because everyone agrees on the addresses and ports used by these services, and because you act as a client to the web server or the email server. However, DCC lies outside these areas and it's unfortunately up to you to configure your connection to make it work. There are two sides to DCC; you either act as a client and make outgoing connections, or as a server where your make your machine wait for incoming connections.

Being a client usually works without problems. That's when you receive a file that someone sends to you or accept a DCC chat request from someone else.

Being a server requires some configuration in almost all cases except the most simple. That's when you want to send a file or initiate a DCC chat connection. If your connection is simple dialup to the internet it's most likely to just work.

However, if you have a high speed connection you have a little box called a DSL modem or router that sits between your computer and the phone line. This box is almost always set up to block incoming connections and to allocate your computer a private internet address (an IP address). A private internet address is not reachable from the outside. This is called NAT or Network Address Translation. An AirPort or other wireless connection does the same thing. In this case the router or AirPort base station uses the public IP address.

When you try to send a file, you are taking the role of a server and your IRC program will tell the other side which internet address and port he should attempt to connect to. The DCC preference panel allows you to set Snak up to use the correct public internet address and port range.

If you think this could get complicated, you are right. You might ask "Why doesn't DCC send just work, just like everything else ? "

The answer is that DCC send is not like everything else. A DCC send makes the program act like a server, not a client. There is no way the IRC program can know the details of your particular internet setup or configure your firewall to accept incoming connections

DCC list inside the profile list

You can monitor your ongoing DCC Connections in the profile list which can be opened with either Cmd-D or Cmd-K. If you use Cmd-D it will preselect the DCC item at the top and give you access to the DCC buttons. The list contains each DCC connection, and provides details of the progress of the transfers.

When you have a DCC item selected the profile list will have buttons to accept or close a particular incoming DCC connection.

Accepting incoming offers

When someone attempts to open a DCC connection to you, either for chat or filetransfer, Snak will display the offer under the DCC item in the profile list so that you can either accept or reject it.

In addition to choosing the DCC offers under the DCC item in the profile list and pressing Get or Chat you can also type "/DCC Get" with an optional nickname. If you do not specify a nickname, the program will accept the first of the currently waiting DCC offers.

You can use an Action to automatically accept incoming DCC offers.

To automatically accept certain offers, open the Actions list and make a new Action. Select "On DCC filetransfer offer" or "On DCC chat offer" as the event.

The response will be preset to "Accept DCC filetransfer" or "Accept DCC chat".

To autoaccept DCC chat or files from a particular nick, fill out the nick field under the event popup.

To autoaccept files of a particular name or extension, fill out the filename field. The field supports wildcards, so use "*.MP3" to autoaccept all files with the MP3 extension.

If you choose the "Accept DCC filetransfer" response you can select the save location for the transfer. By default the location will be the desktop.

You can provide another save location in each DCC accept Action so that you may chose to save MP3 files in one location, pictures in another, everything else in the default location etc.

If there is a filename conflict between an existing file and an automatically received file, the new file will be renamed.


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